Intestinal Protozoa: Giardia, Amebiasis, Cyclospora, Blastocystis hominis, Dientamoeba Fragilis, and Cryptosporidium Parvum

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This chapter focuses on common intestinal protozoal infections that occur among travelers. Giardia lamblia is among the commonest parasite infections acquired by humans and is the most frequently identified cause of prolonged travelers' diarrhea lasting at least 2 weeks. Entamoeba histolytica can cause either gastrointestinal symptoms or amebic liver abscess. Cyclospora typically causes watery diarrhea that, untreated, lasts up to 3 months. Blastocystis hominis is one of the most common organisms detected in stool specimens, but there is considerable controversy about whether it is pathogenic. Other protozoa briefly discussed include Dientamoeba fragilis and Cryptosporidium parvum.

Original languageEnglish
Title of host publicationTropical Diseases in Travelers
Number of pages9
ISBN (Print)9781405184410
Publication statusPublished - 15 Jan 2010
Externally publishedYes


  • Amebiasis
  • Amebic colitis
  • Amebic liver abscess
  • Blastocystis hominis
  • Cryptosporidiosis
  • Cyclosporiasis
  • Dientamoeba fragilis
  • Giardiasis
  • Intestinal protozoa

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